Just installed v1.6.1 and I really like what I see! I have VPC/2 on the same host. I wnat to convert all my VPC/2 sessions to VBox and then use SMP on a new AMD QuadCore.

My current test show that I can run only 1 VBox client vm. The vm session for the second tells me what is pasted below. I have tried reversing the start order and the same message shows to the corresponding client vm.

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Did you also try to update VB to a newer version. Also, 1.6.1 is a developers release and is not out for the public to use. Every odd numbered version of VB is not a public release (up to this point, might change some day). Or at least it's referred to as a non-stable release.